import urllib.parse as parse
url='http://sou.zhaopin.com/jobs/searchresult.ashx?bj=4010200&sj=006&jl=%E5%85%A8%E5%9B%BD&sm=0&p=90&isfilter=0&fl=489&isadv=0&sg=e5dfeddf969442d5a350f5a56996f968'
#print(parse.urlparse(url).query)   # 参数列表
#print(parse.parse_qs(parse.urlparse(url).query))#参数列表解析
qs=parse.parse_qs(parse.urlparse(url).query)
qs['jl'][0]='489'
print('http://sou.zhaopin.com/jobs/searchresult.ashx?'+parse.urlencode(qs))

